Multiplexing signal pseudo-random code blind estimation method, code error correction method and device
A pseudo-random code and multiplexing technology, which is applied in the field of pseudo-random code blind estimation method, error correction method and device for multiplexed signals, and can solve the problems of unauthorized signal decoding, code error, and authorized signal error High error rate and other problems, to achieve the effect of simple error correction method, ensure accuracy, and high error correction efficiency
Active Publication Date: 2021-12-17
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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[0004] In the prior art, the analysis of the pseudo-random code of the multiplexed signal can only be done for public signals (civilian signals in the Beidou satellite system), and for authorized signals (military signals in the Beidou satellite system). However, it cannot analyze its pseudo-random code, track and evaluate it, so that the authorized signal cannot be effectively decoded, resulting in a high bit error rate of the authorized signal; and yes, the signal will be affected by it after passing through the channel. code, the existing technology cannot effectively check whether the pseudo-random code of the authorization signal is wrong
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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0043] The invention discloses a method for blindly estimating pseudo-random codes of multiplexed signals, which comprises the following steps:
[0044] S1: Use the signal receiving device to receive the multiplexed signal and track it, and filter out other component signals through a filter to obtain the reference signal;
[0045] S2: Obtain the baseband signal of the multiplexed signal by using the reference signal and the phase rotation factor of the reference signal;
[0046] S3: Generate a reference complex signal group locally, use the reference complex signal group and the baseband signal to establish a correlation model, and obtain a pseudo-random code symbol combination of each component signal of the multiplexed signal.
[0047] Optionally, in S1, the specific steps for obtaining the reference signal are as follows:
[0048] S101: Use the si...
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The invention discloses a method for blindly estimating pseudo-random codes of multiplexed signals, a method for correcting code errors and a device thereof. The multiplexed signal is received and tracked by a signal receiving device, and other components are filtered out by a filter. signal to obtain the reference signal; use the phase rotation factor of the reference signal and the reference signal to obtain the baseband signal of the multiplexed signal; generate a reference complex signal group locally, and use the reference complex signal group and the baseband signal to establish a correlation model , to obtain the pseudo-random code symbol combination of each component signal of the multiplexed signal. The present invention can effectively analyze the combination of pseudo-random code symbols of other components according to the pseudo-random code information of each component signal in the random code analysis of multiplexed signals, thus ensuring the accuracy of navigation and positioning. Moreover, the code error correction method of the present invention is simple, the error correction efficiency is high, and the code error rate after decoding is low.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for blindly estimating pseudo-random codes of multiplexed signals, a code error correction method and a device. Background technique [0002] Since November 2017, the construction of the Beidou global networking system has entered the fast lane. Up to now, the Beidou-3 system has successfully launched 8 Beidou-3 satellites, forming the simplest system. Beidou-3 has added inter-satellite links, New functions such as global search and rescue broadcast better navigation signals. Beidou-3 is fully forward-compatible with Beidou-2 in terms of technical system. During the transition from Beidou-2 to Beidou-3, it can ensure that old users will not perceive it, new users will improve performance, and finally complete the replacement of old and new technologies. Beidou-3 broadcasts new navigation signals at B1 (1575.42MHz), B2 (1191.795MHz) and B3 (1268.52MHz) fre...
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IPC IPC(8): H04L1/00
CPCH04L1/0038H04L1/004
Inventor 康立
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI